问题描述：
在使用mysql-connector-java-5.1.38-bin.jar版本连接数据库时，出现如下警告：

Thu Jul 07 16:58:37 CST 2016 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.

解决方案：

原因是MySQL在高版本需要指明是否进行SSL连接。
在mysql连接字符串url中加入ssl=true或者false即可：

<property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true" />

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